How to calculate 15 * 4 / 21 8 / 7 / 16

The former 15 is divided by 21, approximately 3, and then multiplied by 4
The latter is divided by 16, about 8, and then by 7

RELATED INFORMATIONS

1. 7 of 20 / [(5 of 6-20 of 3) * 3]
2. Simplify the ratio of 7 / 20 to 5 / 7
3. Simple operation; 16 △ 4 / 5 × 7 / 20
4. How to do 75 times 7 / 74?
5. Can 2 out of 13 * 5 out of 11 + 5 out of 13 * 9 out of 11 be simplified?
6. (7 / 8 + 13 / 6) / 13 / 16 simple calculation method
7. How to calculate (10-7 / 55 × 1) + (9-7 / 55 × 1) + (8-7 / 55 × 1) +. + (1-7 / 55 × 1)?
8. How to calculate 10.55 + 0.6-9.87
9. (simple calculation) (7 / 15-1 / 3) / / 1 / 3 + 1 / 5 (3 / 4 + 1 / 2) / / 5 / 8 2 / 13 + 3 / 4 △ 9 / 10 + 1 / 6 [3 / 4 - (5 / 8-1 / 4)] / / 3 / 8
10. Simple calculation: ① 9 / 10 + (2 / 7 + 1 / 10) ② 5 / 3 - (5 / 13 + 2 / 3) ③ 3 / 4-7 / 15-8 / 15 + 1 / 4 emergency Teachers, come on! (kneeling) As long as there is a responder, give you 5 points of experience immediately!
11. (2 / 9 * 4-8 / 9 * 7 / 16) * 9 / 8 + 5 / 8
12. Calculation: 2 / 9-2 / 9 * 7 / 16
13. If the equation can be easily calculated, it can be simply calculated [5 / 8 - (3 / 8 + 1 / 6)] × 8 / 9
14. Take off formula calculation: - 2 / 9 - + 2 / 9 -2 / 9 - + 2 / 9 = = = =
15. 18 * (4 / 9 + 7 / 12) if you can calculate simply, you can calculate simply (recursive equation calculation)
16. 47.5 plus 4.8 minus 6.05, 15.73 plus 4.5 minus 7.73 plus 5.5!
17. Recursive equation calculation: (1 / 3-1 / 5) × 15 (1 / 8 + 3 / 4) × 17 75 × 1 / 4 + 25 × 25%
18. 2 and 6 / 5 × 1.8 + 7 and 6 / 1 / 9 / 5
19. How to calculate recursion equation easily? 0.98 * 302 =? 25 * 4.4 * 0.7 =? 5.8 * 5.8 + 5.8 * 0.5 + 5.8 =? (0.25 * 12.5) * (4 * 0.8) =? 1.5*105=?32*1.25*2.5=?2.3+1.7*5.5=?
20. 25 column recursive equation calculation, and simple calculation of this problem